許容 方向法에 의한 트러스 構造物의 最適 設計에 관한 硏究

유희중 호남대학교 1990 호남대학교 학술논문집 Vol.11 No.2

In the study, optimize effectively the sections of the truss which takes the multi-loading condition, and the allowable stress, buckling stress, displacement constraints into consideration. The algorithm of this study is made up of sectional optimization using the Feasible Direction Method. The results of this study acquired by beenning applied to structural model of the truss a as follow; 1. It is verified that the algorithm of the study effectively converges, independent of the applied various constraints. 2. The algorithm applied in this study converges independent of the initial value. 3. The algorithm applied in this study converges very rapidly at the optimun solutions in iteration with out oscillation phenomenon is all case. 4. Even though there might be a little defference acoording to the design condition the weight of the truss can be decreaced considerably.

화상처리에 우수한 General Purpose Signal Processor의 설계

유재희,최정현 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-

The VLSI architecture and implementation methodologies for image signal processing, especially for the image communication based on MPEG are presented in this paper. The overviews of MPEG standards and the general requirements on image signal processing are described. Based on those, the powerful instructions suitable for image signal processing are presented. They are conditional branch instructions to ease loop condition test, block read/write instructions to enhance the speed of data fetch from image memory and load/store update instructions to achieve fast contiguous image block load/store from external image memory. The VLSI implementation structures for those instructions are described. Finally, a high speed multiprocessor architecture based on the presented image signal processor is described.

多段階 分割技法에 의한 鐵塔構造物의 形狀最適化에 관한 硏究

柳熙仲 湖南大學校 1996 호남대학교 학술논문집 Vol.17 No.2

직병렬 복합구조의 요소로 사용되기에 적합한 병렬 로봇 모듈이 조사되었다. Branch당 하나의 구동 조인트를 갖는 3개의 직렬 branch로 구성된 3 자유도의 병렬 구조 모듈(3-3-1,1,1)이 기구설계와 성능 측면의 관점에서 가장 적합한 구조로 선택되었다. 각각의 직렬 branch는 선단에 spherical 조인트를 기저에 1 자유도를 갖는 구동 조인트를 그리고 하나의 1 자유도를 갖는 수동 조인트를 사용하는 것이 가장 적합한 선택임이 보여졌다. In this research, configuration design optimization of planar tower structure has been tested by using multi-level decomposition technique. In the first level, the weight function has been adopted as objective function in order to minimize structures. For the design constraint, allowable stress, buckling stress constraint under multi-loading condition and upper and lower constraints of the design variable are considered. The nonlinear programming problem was transferred into the linear programming problem which is effective in view of calculation by the approximation of the member stress using design space approach which has been proved to be efficient to the sensitivity analysis. In the second level, the nodal point coordinates of the planar tower structure are used as coordinating variable and the objective function has been taken as the weight function. By treating the nodal point coordinates as design variable, unconstrained optimal design problems are easy to solve. In the multi-level, decomposition method which optimize the section areas in the first level and optimize configuration variables in the second level was applied to the planar tower structure. The optimal configuraion of the planar tower structures obtained in this study is almost the identical one from other results. Therefore it can be concluded that multi-level decomposition technique proposed in this research is helpful to the economical design of the large scale planar towers.

Rock Bolt의 길이 및 配置가 地下構造物의 支保效果에 미치는 影響

유희중,조기옥 호남대학교 산업기술연구소 1997 산업기술연구논문집 Vol.4 No.-

본 실험적 연구는 Rock Bolt의 길이와 배치간격이 지하 구조물의 지보효과에 미치는 영향을 고찰하기 위하여, 시공 중인 터널공사의 실물을 대상으로 실험을 수행하였다. 실험은 8개소의 장소를 선정하여 4종류로 모델화하였고, 각 모델은 암질이 유사한 2개소를 묶어 상호 비교할 수 있도록 하였으며, Rock Bolt의 길이와 간격을 동일 또는 상이하게 배치하여 각 모델별로 분석이 가능토록 하였다. 연구결과 Rock Bolt의 길이가 길어질수록 넓게 배치할 수 있었으나, 일정 수량 이상의 배치는 Bolt수량의 증가만큼 지보효과를 높일 수 없었다. 또한 같은 강도의 암질이라 할지라도, 절리의 방향과 위치에 따라 Rock Bolt의 Bolting 방향과 시공시기가 지보효과에 상당한 영향이 있는 것으로 판단되어, 앞으로 이 분야에 대한 연구가 있어야 할 것으로 사료된다. In this research, reinforcing fects of the length and the space of rock bolt on the underground structure was investigated through field test at the tunnelling work sites. In this test, 8 test sites were selected and modelized of 4 groups. Each group was consisted of 2 rock masses with equal quality to facilitate comparison of the reinforcing effects of length or space of the rock bolt. As a results, the length of rock bolt should be determined by the consideration of rock mass quality and tunnel width. The space of rock bolt could be increased as the length of rock bolt. The more rock bolts were installed, the more the tunnel was reinforced, the more the reinforcing effect of each rock bolt was diminished. Even if the strength of rock mass are equal, it was found that reinforcing effects are varied with the orientation and the installation time of rock bolts and with the orientation and the location of joints. So the continuous study on the rock bolting system with these variables is more desirable.

다목적 함수를 갖는 트러스 구조물의 퍼지 최적화

유희중 湖南大學校 1997 호남대학교 학술논문집 Vol.18 No.2

This study aims at the analysis, utlity and application of this research from the results on optimization of the truss structure having the muliti-objective function of volume and displacement which is conflicting each other in properties and the constraint which is including uncertainties by using fuzzy theory. In the formulation of optimum problems the design variablesare taken as the cross sectional areas, volume is taken as the first objective function and displacement conflicting with the first objective functionas the second objective function and the constraints consist of the fuzzy stress constraints of the 2-member, 7-member, and 10-member truss structures. The optimum solutions of 3-type truss structures are gained from applying weighting method using feasible direction method. The numerical results of the algorithm in this research is numerically tested for 3-type truss structures can be summerized as follows; Without regrading to the types and shapes of truss structures, the numbers of loading and the constraint conditions are converged within four cycle optimum solutions. The user can choose the one optimum solution in practices as obtaining the optimum solutions according to the α-cut, displacement weight and volume weight. The optimal procedure of this study can be applied optimum design of complex structures having various sagment structures.

사회성 훈련 프로그램이 발달장애아동의 사회성 및 적응행동에 미치는 효과

유은희,양정남,이숙자 동신대학교 2005 論文集 Vol.15 No.-

The Effects of a Social Skills Program on Improving Sociability, and Adaptive Behaviors of Children with Developmental Disabilities. The purpose of this study was to investigate the effects of a social skills program on improving social skills, and adaptive behaviors of children with developmental disabilities. A total of nine children at the Language Therapy Center for children and adolescents in Gwangju Metropolitan City participated in this study with the consent from their parents. The research was conducted following one-group pretest-posttest design, a preexperimental design. A social skills program was implemented once a week with 90 minutes per session for 15 weeks. The effects of the program were evaluated by administering Social Maturity Scale, and Adaptive Behavior Scale before and after the program. The results showed that the scores in social maturity, and adaptive behavior scales, respectively, increased from pretest to posttest. This study concluded with a discussion on the implications of social skill programs for improving social skills, and adaptive behaviors of children with developmental disabilities in the field of social welfare. Implications and suggestion for future studies was discussed.

RAPD와 핵 리보솜 DNA ITS2 염기서열에 의한 한국산 전나무속 식물의 유전적 변이 및 계통유전학적 분석

정용환,한상현,오유성,고미희,고석찬,김문홍,오문유 濟州大學校 基礎科學硏究所 2001 基礎科學硏究 Vol.14 No.2

We analyzed the genetic variation and phylogenetic relationship among fourteen taxa of GenusAbies distributed in Korea using random amplified polymorphic DNA (RAPD) and internal transcribed spacer (ITS) 2 sequences of the nuclear ribosomal DNA (rDNA). RAPDs were used for identification of selected taxa by amplification using single 10-mer primers of arbitrary sequence. Fourteen taxa were clearly classified with 10 arbitrary primers, which generated 102 useful polymorphic bands that were evaluated according to the presence or absence of the fragments of equal size. The genetic distance between A. koreana for. chlorocarpa and A. koreana for. rubrocarpa was 0.127, showing the closest among any other pairs. By comparing the base sequences in the ITS2 region of the nuclear rDNA, genetic relationship was assesed among selected taxa. It showed twenty six sites of point mutation (base substitution) in 243 base pairs (bp) of ITS2 region. The G+C contents of ITS2 region were ranged from 58.3% to 61.7%. The value of nucleotide divergence among selected taxa was ranged from 0.4% to 9.8%. These results showed that RAPD and ITS2 sequence analysis was a useful tool for elucidating phylogenetic relationship and selection of specific marker in Abies species.

가족 내의 위험 요인이 ADHD 아동의 행동 문제에 미치는 영향

유희정,김진희 대한소아ㆍ청소년정신의학회 1999 소아청소년정신의학 Vol.10 No.2

섬유보강재를 사용한 콘크리트의 개발(특성 및 실용화)

유희종,이계학 호남대학교 산업기술연구소 1998 산업기술연구논문집 Vol.6 No.-

본 연구는 최근 활발히 전개되고 있는 새로운 건설 재료 개발을 위한 노력의 하나로서 강섬유콘크리트의 개발에 따른 역학적 특성과 실용화에 관하여 고찰하였다. 본 연구의 포괄적인 수행에 있어서는 굵은 골재 최대 치수와 강섬유의 혼입률 및 섬유 길이를 주요 실험 변수로 하였다. 강섬유콘트리트의 역학적 특성을 규명하기 위하여 휨거동 파괴인성등을 조사 분석하였다. 시험결과 섬유의 혼입률 및 섬유길이 증가에 따라 휨강도가 증가하며, 특히 파괴 인성이 크게 증가함을 알 수 있었다. 이것은 강섬유의 효과가 콘크리트의 휨, 인성 파괴에서 더욱 크게 나타남을 의미하고 있다. 또한 본 연구에서 강섬유 콘크리트의 역학적 특성규명과 함께 강섬유 콘크리트의 실용화를 위한 기초자료를 제시하였다. Recently, the fiber-reinforced concrete in recognized as noe of the most promising new construction materials. This study was conducted to explore the mechanical behavior and practical use of steel fiber reinforced concrete. The major variables in the experiment were the fiber contents, the lengths of steel fibers and aggregates. The fracture energy, deflection, flexural behavior of steel fiber reinforced concrete were investigated. The present study shows that the flexural strength and fracture energy are remarkably in creased on increase of fiber contents. This indicates that the steel fibers play a major role in increasing the fracture capacity. The present study gives a through examination on the mechanical behavior of steel fiber reinforced concrete and allows more realistic use of steel fiber reinforced concrete.

Pseudomonas fluorescens의 Salicylate hydroxylase를 암호하는 유전자의 클로닝

정유선,민경희,이나리 숙명여자대학교 자연과학연구소 1997 자연과학논문집 Vol.- No.8

Pseudomonas fluorescens SME11로 부터 salicylate hydroxylase를 암호하는 nahG 유전자를 클로닝하기 위하여 NAH플라스미드를 주형으로 하여 PCR을 수행하였다. PCR방법으로 얻은 1.6kb DNA절편을 pT7Blue(R)벡터에 삽입시켜 재조합 플라스미드 pNY1을 제조하였으며 이것을 E. coli에 형질전환하였다. 재조합 DNA를 제한효소로 처리하여 EcoRⅤ, KpnⅠ, PvuⅡ, StuⅠ등이 존재함을 확인하였으며, 이것으로 간단한 제한효소지도를 작성하였고 재조합 DNA를 한 방향으로 deletion하여, nahG유전자를 포함한 DNA절편의 염기서열을 결정하였다. 재조합 플라스미드인 pNY1에는 1,305bp크기의 open reading frame이 존재하였으며, salicylate hydroxylase에 해당하는 434개의 아미노산을 암호하였다. 아미노산서열을 비교한 결과, P.putida KF715와 84.1%, P.putida PpG7과 71.4%, P.putida S-1 과 48.7%의 homology를 보였으며, 또한 Sphingmonas sp.와 26.8%의 homology를 보였다. Pseudomonas fluorescens SME11 carrying NAH plasmid was isolated from wastewater. To clone nahG gene encoding salicylate hydroxylase, 1.6kb DNA fragment of PCR product from NAH plasmid was inserted to pT7Blue(R) vertor and resulting recombinant DNA was named pNY1. The transformants, E.coli SMY1, clone containing the recombinant plasmid pNY1 were able to convert salicylate to catechol and produced dark brown color caused by accumulation and auto-oxidation of catechol. Restriction endonuclease mapping of 1.6kb size of the insert of the recombinant plasmid pNY1 was carried out with EcoRⅤ, KpnⅠ, PvuⅡ, StuⅠ. By means of unidirectional ExoⅢ deletion and dideoxynucleotide chain termination, we determined the nucleotide sequence of the DNA fragment containing nahG gene. One open reading frame of 1,305 bp corresponding to 434 amino acids was found in the insert DNA. Deduced amino acid sequences of the nahG gene showed 84.1%, 71.4%, 48.7%, and 26.8% homologies to those from P.putida KF715, P. putida PpG7, P. putida S-1, and Sphingmonas sp., respectively.